Source Location in Plates by Using Wavelet Transform of AE Signals

초록

The accuracy of source location in plate or plate-like structures is greatly affected by the dispersion characteristics of acoustic emission(AE) waves. In order to improve the accuracy, the detected AE signals were pre-processed by using wavelet transform to be decomposed into the low frequency flexural wave and the high frequency extensional wave. Since the flexural wave is highly dispersive, a decomposed flexural component has been extracted for a single frequency or within a very narrow frequency band by inverse wavelet transform. The calculation of arrival time differences was based on the threshold crossing time. The experimental corroboration has been made for an Al6061 plate and a CFRP laminate.